Imagine spiraling down a waterslide before taking a break for street tacos and margaritas while a live band rocks out in the background. Or maybe a day at the spa followed by an al fresco dinner under the stars is more your speed? The Carnival Fantasy has that, too. Carnival Cruise line prides itself on showing the world how fun is done on the open sea, and its Fantasy class brings both the party and the R&R. Set sail to the Caribbean for a short jaunt on the turquoise waters, or, if you can carve out 10 days, an exhilarating journey to the Panama Canal will be one for the books.